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The Combined Effect of Tibetan Plateau Uplift and glacial-interglacial cycles on the Quaternary Evolution of the East Asian Monsoon: Evidence from South China Sea Sediments

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Acta Geologica Sinica(English Edition) 2014年第2期88卷 661-668页

作者： MENG Xianwei LIU Yanguang ZHANG Xiaodong ZHANG Jun First Institute of Oceanography State Oceanic Administration Ocean University of China

The siliciclastic sediments of the uppermost section of 185 mcd （meters composite depth） from ODP Site 1146 on the northern continental slope of the South China Sea （SCS） were partitioned according to their sources using end-member modeling on grain-size *** goal was to evaluate the evolution of the East Asian monsoon over the past 2 million *** siliciclastic sediments were described as hybrids of four end-members,EM1,EM2,EM3,and EM4,with modal grain sizes of 8-22 μm,2-8 μm,31-125 μm,and 4-11 μm,***1 and EM3 are interpreted as eolian dust and EM2 and EM4 as fluvial *** ratio of eolian dust to fluvial mud （（EM1＋EM3）/（EM2＋EM4）） is regarded as an indicator of the East Asian *** variation in this ratio not only shows periodical oscillations consistent with oxygen isotope stages,but also exhibits a phased increasing trend corresponding with the phased uplifts of the Tibetan Plateau,indicating that the evolution of the East Asian Monsoon was controlled not only by glacial-interglacial cycles,but also by the phased uplifts of the Tibetan Plateau during the Quaternary.

关键词： East Asian monsoon South China Sea Tibetan Plateau uplift glacial-interglacial cycle Quaternary

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Advance-retreat history of the East-Asian summer monsoon rainfall belt over northern China during the last two glacial-interglacial cycles

Advance-retreat history of the East-Asian summer monsoon rai...

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中国科学院地质与地球物理研究所2008学术年会

作者： Shiling Yang~*,Zhongli Ding Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

In northern China,the history of desert migration provides a good measure of the East-Asian summer monsoon variations,since the desert margin environment is very sensitive to changes in summer monsoon *** margin migration can be well documented in the downwind loess deposits,since the grain size of Chinese loess is principally controlled by source-to-sink distance and hence the loess grain size is an effective proxy for reconstructing the history of the East-Asian summer *** order to investigate the pattern and migration of the summer monsoon rainfall belt over northern China during the past two glacialinterglacial cycles,contour maps of loess grain size were constructed for MIS 2,3,4,5,6 and *** the grainsize isolines show a near north-south gradient for both glacials and interglacials,indicating a dominant dust source region in north and an approximately north-south dust transport pathway for dust deposits in the main body of the Loess Plateau,at least for the past two glacial-interglacial *** reconstructed southeast desert margin for MIS 2,3,4,5,6 and 7 roughly parallels the present isohyets,implying that the pattern of the East-Asian summer monsoon rainfall belt during the past two glacial-interglacial cycles is similar to the present,i.e.a northeast-southwest trend for the isohyets of the summer monsoon,despite the glacial-interglacial *** the grain-size isolines of MIS 2 as a reference,we derive a northerly desert retreat of～160 km,～19 km,～225 km and～223 km for MIS 3,4,5 and 7,respectively,and a southerly desert advance of～29 km for MIS 6,that could be preliminarily regarded as the relative migration distance for the East-Asian summer monsoon rainfall belt In addition,the inferred climate conditions in MIS 3 are cool and humid in northern China,while the driest and coldest interval of the last two glacial periods occurs in MIS 6.

关键词： East-Asian summer monsoon rainfall belt Chinese loess grain size Mu Us desert glacial-interglacial cycle

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